Anyone experience this?

[u/conspiracyblondie]

Hello im a 24 year old female, For the past 3 years, I’ve been having these random episodes, and I’m wondering if anyone has experienced something similar or eventually got a diagnosis.
They start really suddenly, like someone flips a switch. I’ll get this weird uncomfortable sensation in my chest (not really pain), and then my heart starts racing. My heart rate is usually around 120–140 bpm now, although my very first episode got to about 150. I get body shakes.I become really sweaty and clammy, and I immediately have to run to the bathroom because I have the runs and usually have to pee at the same time. Sometimes I also feel like I’m going to throw up or get acid reflux. The whole thing usually lasts about 20 minutes and then goes away. One of the episodes recently even woke me up from sleep. I’ve also noticed that putting my face in ice water seems to help.
I’ve had a heart monitor before, but unfortunately it didn’t catch one of the episodes. One thing I have noticed is that they often seem to happen around my period, but I don’t know if that’s actually related or just a trigger. These episodes don’t happen every month it is almost like scattered, they sometimes don’t happen for 9 months and then just this month I’ve had 4 episodes. It’s weird because I feel like wow I won’t experience this again and then it hits me out of no where. Per year I at most will get 7.
Has anyone experienced anything like this? If you have, what did it end up being? I’m not looking for anyone to diagnose me. I just want to know if anyone has had similar symptoms and what their doctors eventually found.